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Finding the Fourth Proportional to 440.28, 660.45 and 115.64

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Solution

The fourth proportional to 440.28, 660.45 and 115.64 is: 173.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.28 : 660.45 = 115.64 : x
  2. Step 2: Convert to fraction form
    440.28/660.45 = 115.64/x
  3. Step 3: Cross multiply
    440.28x = 660.45 × 115.64
  4. Step 4: Simplify right side
    440.28x = 76,371.14
  5. Step 5: Solve for x
    x = 76,371.14/440.28
  6. Step 6: Final answer
    x = 173.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.